package com.webserver.http;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class HttpServletResponse {
    private Socket socket;

    private int statusCode = 200;
    private String statusReason = "OK";
    private Map<String, String> header = new HashMap<>();
    private File contentFile;

    public HttpServletResponse(Socket socket) {
        this.socket = socket;
    }

    public void response() throws IOException {
        sendStatusLine();
        sendHeaders();
        sendContent();
    }

    public void sendStatusLine() throws IOException {
        println("HTTP/1.1" + " " + statusCode + " " + statusReason);
    }

    private void sendHeaders() throws IOException {
        Set<Map.Entry<String, String>> entrySet = header.entrySet();
        for (Map.Entry<String, String> e : entrySet) {
            String key = e.getKey();
            String value = e.getValue();
            println(key + ": " + value);
        }
        println("");
    }

    private void sendContent() throws IOException {
        OutputStream out = socket.getOutputStream();
        if (contentFile != null) {
            try (
                    FileInputStream fis = new FileInputStream(contentFile);
            ) {
                byte[] data = new byte[1024 * 10];
                int len;
                while ((len = fis.read(data)) != -1) {
                    out.write(data, 0, len);
                }
            }
        }
    }

    private void println(String line) throws IOException {
        OutputStream out = socket.getOutputStream();
        out.write(line.getBytes(StandardCharsets.ISO_8859_1));
        out.write(13);
        out.write(10);
    }

    public int getStatusCode() {
        return statusCode;
    }

    public void setStatusCode(int statusCode) {
        this.statusCode = statusCode;
    }

    public String getStatusReason() {
        return statusReason;
    }

    public void setStatusReason(String statusReason) {
        this.statusReason = statusReason;
    }

    public File getContentFile() {
        return contentFile;
    }

    public void setContentFile(File contentFile) {
        this.contentFile = contentFile;
        addHeader("Content-Type", "text/html");
        addHeader("Content-Length", contentFile.length() + "");

    }

    public void addHeader(String name, String value) {
        header.put(name, value);
    }

    public void sendRedirect(String location){
        statusCode = 302;
        statusReason = "Moved Temporarily";
        addHeader("Location",location);

    }
}
